Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd81b99a2167a652…

MALICIOUS

PDF

75.0 KB Created: 2021-02-09 07:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 85b00218de79017b46e7756e92e04059 SHA-1: e685a313b96e34bde822d92caf000dc97bbabcfd SHA-256: cd81b99a2167a6521a10752904a4fffd9c30a0c9b5645cf9ca7cb3e1320fc2d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/aws?utm_term=full+website+er+chrome PDF link annotation
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/bapupimeposewum-wibeduraxa.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/nasemigoxaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5fc80c68c6871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455174/normal_5fce945038516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_60020726c3d6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413227/normal_5ff8d72134e0f.pdfIn PDF document text
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/vezem-ligofemifof-repitug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/54789075791.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/cinnamon_girl_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/visio_org_chart_template_no_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/python_format_list_of_values.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/95322231224.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/anlise_financeira_fundamentalista_de_empresas.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/hand_gesture_recognition_using_matlab_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/xoxudupajafeka.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/87548531227.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5016 bytes
SHA-256: 3e85d9d5d6b77a4702009ba9369b7cb61ec4d548b45c0986a811a3be1fd0dc0c
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 11288 bytes
SHA-256: a4c09d050bb0f9755f3ed7d0071c7ba282495d0fd1fc9d1f92bb3e711a6082a2

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